For some reason it was working but now skyrim not working anymore or is there somethinge wrong after downloading dragonborn,heartfire and dawnguard?

I have Win 7 / 64 Max edition and GeForce GTX 690. Both Dragonborn and Dawnguard work good, I just have to delete time to time saved game (I am on level 76 or something right now, too many SAVE GAME) . Hearthfire causes crash at every start so I just do not play it.

I have Windows 7 and all the Mods your thread about not buying the game with Windows 7 is absurd since I have played almost 1300 hours with no poblems. You probably have a mod problem and like most are blaming the game.